JP2005310611A - Backlight device and display - Google Patents
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- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0028—Light guide, e.g. taper
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
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- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
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- G02B6/0033—Means for improving the coupling-out of light from the light guide
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Abstract
Description
本発明は、バックライト装置及び表示装置に係り、特に表示装置の背面側に設置されて当該表示装置に光源光を照射させる発光ダイオードに代表される固体発光素子（ＬＥＤ）直下型バックライト装置及び当該バックライト装置を用いた表示装置に関するものである。 The present invention relates to a backlight device and a display device, and more particularly to a solid state light emitting device (LED) direct-type backlight device represented by a light emitting diode that is installed on the back side of the display device and irradiates the display device with light source light, and The present invention relates to a display device using the backlight device.
近年、大型液晶テレビや大型液晶モニタ等に用いられるバックライトとしては、主に冷陰極蛍光ランプが多く使用されている。この冷陰極蛍光ランプを使用したバックライト装置は、導光体の側辺に冷陰極蛍光ランプを配置したサイドエッジ型のバックライト装置と、液晶表示パネルの背面に導光体を配置せずに冷陰極蛍光ランプを複数本併設する直下型のバックライト装置との二つに大別される。 In recent years, many cold cathode fluorescent lamps are mainly used as backlights for large liquid crystal televisions, large liquid crystal monitors and the like. The backlight device using the cold cathode fluorescent lamp has a side edge type backlight device in which a cold cathode fluorescent lamp is arranged on the side of the light guide, and a light guide is not arranged on the back of the liquid crystal display panel. It is roughly divided into two types: a direct-type backlight device having a plurality of cold cathode fluorescent lamps.
サイドエッジ型のバックライト装置は、比較的コンパクトな構造に構成できる長所がある反面、光利用効率が低いという短所がある。一方、直下型のバックライト装置は、光利用効率が高い反面、バックライト装置の厚みが大きくなってしまう。このような冷陰極蛍光ランプを光源として使用したバックライト装置に代わるものとして、近年、色再現性が高く、且つ応答速度が速く、しかも、環境保全に対応した水銀レスである発光ダイオードに代表される固体発光素子（ＬＥＤ）を光源として使用するバックライト装置が各社で検討され、研究，開発が進められている。 The side-edge type backlight device has an advantage that it can be configured in a relatively compact structure, but has a disadvantage that light utilization efficiency is low. On the other hand, the direct type backlight device has high light utilization efficiency, but the thickness of the backlight device is increased. As an alternative to a backlight device using such a cold cathode fluorescent lamp as a light source, in recent years, it has been typified by a mercury-free light-emitting diode that has high color reproducibility, has a high response speed, and is environmentally friendly. Backlight devices that use solid-state light emitting devices (LEDs) as light sources have been studied by various companies, and research and development are underway.
近年、固体発光素子は、Ｒ（赤），Ｇ（緑），Ｂ（青）３色発光の固体発光素子と、白色発光の固体発光素子とが開発されている。バックライト装置の光源として使用する固体発光素子としては、最終的には表示パネルに白色光を照射させたいことから、白色発光の固体発光素子を使用することが考えられるが、この白色光を出射する白色固体発光素子は、青色固体発光素子や紫外光固体発光素子からの発光色を蛍光体により白色にして白色光を得ているので、演色性が悪く、色再現性の範囲が狭くなるという課題がある。 In recent years, solid-state light-emitting devices have been developed that emit R (red), G (green), and B (blue) three-color light-emitting devices and white light-emitting solid-state light-emitting devices. As a solid-state light-emitting element used as a light source of a backlight device, it is conceivable to use a white-light-emitting solid-state light-emitting element because it is desired to eventually irradiate the display panel with white light. The white solid-state light emitting device produces white light by using a phosphor to emit white light from the blue solid-state light-emitting device or the ultraviolet light solid-state light-emitting device, resulting in poor color rendering and a narrow color reproducibility range. There are challenges.
一方、Ｒ（赤），Ｇ（緑），Ｂ（青）３色発光の固体発光素子は、白色固体発光素子に比べて広い色再現性の範囲が得られる点と、Ｒ（赤），Ｇ（緑），Ｂ（青）３色発光の固体発光素子の電流量を可変することにより、バックライトの色度を自在に可変できる点とで優れている。このような観点から、現時点ではＲ（赤），Ｇ（緑），Ｂ（青）３色発光の固体発光素子を使用することが好適である。 On the other hand, R (red), G (green), and B (blue) three-color solid-state light emitting devices can obtain a wider color reproducibility range than white solid-state light emitting devices, and R (red), G It is excellent in that the chromaticity of the backlight can be freely changed by changing the amount of current of the solid-state light emitting element emitting (green) and B (blue) three colors. From this point of view, it is preferable to use a solid-state light emitting element emitting R (red), G (green), and B (blue) three colors at present.
Ｒ（赤），Ｇ（緑），Ｂ（青）３色発光の固体発光素子を光源として使用するバックライト装置の構成としては、表示パネルの背面にＲ（赤），Ｇ（緑），Ｂ（青）３色発光の固体発光素子を配置することが考えられるが、この構成を図１９に要部展開斜視図で示す。図１９に示すように表示パネルとして例えば液晶表示パネルの背面には、Ｒ（赤），Ｇ（緑），Ｂ（青）３色発光の固体発光素子ＬＥＤを搭載した固体発光素子アレイＡＬＬが配置され、その背面にはリフレクタＲＥＦ１０が配置され、その側面側にはサイドリフレクタＲＥＦ１１，ＲＥＦ１２，ＲＥＦ１３，ＲＥＦ１４が配置されている。 As a configuration of a backlight device using a solid-state light emitting element emitting R (red), G (green), and B (blue) as a light source, R (red), G (green), B on the back of the display panel. (Blue) Although it is possible to arrange | position the solid light emitting element of 3 color light emission, this structure is shown with a principal part expanded perspective view in FIG. As shown in FIG. 19, as a display panel, for example, on the back of a liquid crystal display panel, a solid state light emitting element array ALL mounted with solid state light emitting elements LED emitting three colors of R (red), G (green), and B (blue) is arranged. The reflector REF10 is disposed on the rear surface thereof, and the side reflectors REF11, REF12, REF13, and REF14 are disposed on the side surface thereof.
また、この固体発光素子アレイＡＬＬの上方には、空気層ＡＲＬを介して光学補償シート積層体ＯＰＳが配置されており、この光学補償シート積層体ＯＰＳは、固体発光素子アレイＡＬＬ側から第１の拡散シートＤＦ１，第１のプリズムシートＰＲＺ１，第２のプリズムシートＰＲＺ２，第２の拡散シートＤＦ２の順で積層されて形成されている。また、この光学補償積層体ＯＰＳと、Ｒ（赤），Ｇ（緑），Ｂ（青）３色発光の固体発光素子ＬＥＤを搭載した固体発光素子ＡＬＬとの間には比較的層厚の大きい空気層ＡＲＬが配置されている。 Further, an optical compensation sheet laminate OPS is disposed above the solid light emitting element array ALL via an air layer ARL. The optical compensation sheet laminate OPS is arranged in the first from the solid light emitting element array ALL side. The diffusion sheet DF1, the first prism sheet PRZ1, the second prism sheet PRZ2, and the second diffusion sheet DF2 are laminated in this order. In addition, a relatively large layer thickness is formed between the optical compensation laminate OPS and the solid-state light-emitting element ALL on which R (red), G (green), and B (blue) three-color solid-state light-emitting elements LED are mounted. An air layer ARL is disposed.
このように構成されるバックライト装置では、Ｒ（赤），Ｇ（緑），Ｂ（青）の３色発光固体発光素子ＬＥＤ光源から発する光を空気層ＡＲＬ，リフレクタＲＥＦ１０及びサイドリフレクタＲＥＦ１１〜ＲＥＦ１４により、色混合を行い、表示パネルとして例えば液晶表示パネルの背面に照射させる構成である。 In the backlight device configured as described above, light emitted from the three-color light emitting solid-state light emitting element LED light sources of R (red), G (green), and B (blue) is emitted from the air layer ARL, the reflector REF10, and the side reflectors REF11 to REF14. Thus, color mixing is performed, and the back of the liquid crystal display panel, for example, is irradiated as a display panel.
このようなバックライト装置の光源として固体発光素子を使用する構成については、下記「特許文献１」に開示されている。また、Ｒ（赤），Ｇ（緑），Ｂ（青）の３色発光の固体発光素子光源を使用して混色させることにより、白色光を液晶表示パネルに照射する構成については下記「非特許文献１」に開示されている。また、導光体の背面側に色混合用のライトガイドを配設する構成については下記「非特許文献２」に開示されている。
A configuration in which a solid-state light emitting element is used as a light source of such a backlight device is disclosed in the following “Patent Document 1”. In addition, a configuration for irradiating a liquid crystal display panel with white light by using a solid-state light emitting element light source of three colors of light emission of R (red), G (green), and B (blue) to irradiate the liquid crystal display panel is described below. Reference 1 ”. A configuration in which a light guide for color mixing is disposed on the back side of the light guide is disclosed in “Non-Patent
なお、導光体に発光素子として発光ダイオードを光源として使用した表示装置は、例えば下記「特許文献１」，「非特許文献１」及び「非特許文献２」を挙げることができる。
Examples of the display device using a light-emitting diode as a light source for the light guide as a light source include “Patent Document 1”, “Non-Patent Document 1”, and “Non-Patent
しかしながら、このように構成されたバックライト装置では、良好に色混色を行うためには、Ｒ（赤），Ｇ（緑），Ｂ（青）３色発光の固体発光素子ＬＥＤ光源と、光学補償シート積層体ＯＰＳとの間に形成する空気層ＡＲＬの厚さを大きくする必要がある。つまり、厚さの大きい隙間を設ける必要があり、その分バックライト部の厚さが大きく形成され、形状等も大きく構成されてしまうという課題があった。 However, in the backlight device configured in this way, in order to perform color mixing well, a solid light emitting element LED light source emitting R (red), G (green), and B (blue) three colors and an optical compensation are provided. It is necessary to increase the thickness of the air layer ARL formed between the sheet laminate OPS. That is, it is necessary to provide a gap having a large thickness, and accordingly, there is a problem that the thickness of the backlight portion is increased and the shape and the like are increased.
したがって、本発明は、前述した従来の課題を解決するためになされたものであり、その目的は、Ｒ（赤），Ｇ（緑），Ｂ（青）３色発光の固体発光素子を光源として使用するバックライト装置について当該バックライト部を薄く構成することによって、良好な色混合を行うことができ、これによって光利用効率を向上させ、輝度均一性及び色度均一性の高い光源光が得られ、しかも軽量化させることができるバックライト装置を提供することにある。 Accordingly, the present invention has been made to solve the above-described conventional problems, and an object of the present invention is to use R (red), G (green), and B (blue) three-color solid-state light emitting elements as light sources. By configuring the backlight unit to be thin for the backlight device to be used, it is possible to perform good color mixing, thereby improving light utilization efficiency and obtaining light source light with high luminance uniformity and chromaticity uniformity. It is another object of the present invention to provide a backlight device that can be reduced in weight.
本発明の他の目的は、輝度均一性及び色度均一性の高い光源光が得られるバックライト装置を用いて色再現性の高い、しかも応答度が速い高輝度の表示画像が得られる固体発光素子直下型バックライト装置を有する表示装置を提供することにある。 Another object of the present invention is to provide a solid-state light emitting device capable of obtaining a high-luminance display image with high color reproducibility and quick response using a backlight device capable of obtaining light source light with high luminance uniformity and chromaticity uniformity. An object of the present invention is to provide a display device having a backlight device directly under the element.
このような目的を達成するために本発明によるバックライト装置は、前面に光を面状に展開して出射する光出射面を有し、且つこの光出射面に反対向してこの光出射面に光を反射させる光反射面を有する主導光体と、この主導光体の背面に設置され、且つ中央部に第１の空気層を介して両端側に第１の副導光体と第２の副導光体とに分割されて当該第１の空気層内で当該第１の副導光体と当該第２の副導光体との対向端面に光入射面を形成する副導光体と、この副導光体の主導光体と対向する前面に設置された第１の光反射板と、副導光体の第１の光反射板と反対向する背面に設置された第２の光反射板と、主導光体及び副導光体の両端面に設置され、且つ当該主導光体と副導光体とを光学的に結合させるリフレクタと、副導光体の背面に対向し、且つ第１の空気層内に複数色発光の固体発光素子を少なくとも一列に配列させて設置された固体発光素子基板とで構成することにより、高輝度及び長い光路長が得られ、バックライト部が薄く構成できるので、背景技術の課題を解決することができる。 In order to achieve such an object, the backlight device according to the present invention has a light emitting surface for emitting and emitting light in a planar shape on the front surface, and the light emitting surface opposite to the light emitting surface. A main light body having a light reflecting surface for reflecting light, a first sub-light guide body and a second light body installed on the back surface of the main light body, with a first air layer at the center and both ends. The sub-light guide is divided into a second light guide and forms a light incident surface on the opposing end surface of the first sub-light guide and the second sub-light guide in the first air layer. And a first light reflecting plate installed on the front surface facing the main light body of the sub light guide, and a second light plate installed on the back surface facing the first light reflecting plate of the sub light guide body. A light reflector, a reflector installed on both end faces of the main light guide and the sub light guide, and optically coupling the main light guide and the sub light guide, and a back surface of the sub light guide And a solid-state light-emitting element substrate in which a plurality of solid-state light-emitting elements are arranged in at least one row in the first air layer, whereby high brightness and a long optical path length can be obtained. Since the portion can be made thin, the problems of the background art can be solved.
また、本発明によるバックライト装置は、好ましくは、上記構成において、固体発光素子をサイドエミッタタイプの固体発光素子とすることにより、高輝度及び長い光路長が得られるので、背景技術の課題を解決することができる。 In addition, the backlight device according to the present invention preferably solves the problems of the background art because, in the above configuration, the solid light emitting element is a side emitter type solid light emitting element, so that high brightness and a long optical path length can be obtained. can do.
また、本発明によるバックライト装置は、好ましくは、上記構成において、固体発光素子基板は、複数色発光の固体発光素子を第１の空気層内に対向配列させて第１の空気層の表裏面に設置することにより、高輝度及び長い光路長が得られるので、背景技術の課題を解決することができる。 In the backlight device according to the present invention, preferably, in the above-described configuration, the solid-state light-emitting element substrate has a plurality of color-emitting solid-state light-emitting elements arranged opposite to each other in the first air layer. By installing in a high brightness and high optical path length can be obtained, the problems of the background art can be solved.
また、本発明によるバックライト装置は、好ましくは、上記構成において、第１の副導光体及び第２の副導光体を透光性容器内に透光性液体を封入して構成することにより、副導光体の重量が軽量化されるので、背景技術の課題を解決することができる。 In the backlight device according to the present invention, preferably, in the above-described configuration, the first sub light guide and the second sub light guide are configured by enclosing a light transmitting liquid in a light transmitting container. Thus, the weight of the sub light guide is reduced, so that the problem of the background art can be solved.
また、本発明によるバックライト装置は、好ましくは、上記構成において、第１の副導光体及び前記第２の副導光体内にそれぞれ少なくとも一層の第２の空気層を設けることにより、副導光板の重量を軽量化されるので、背景技術の課題を解決ることができる。 In the backlight device according to the present invention, preferably, in the above-described configuration, at least one second air layer is provided in each of the first sub light guide and the second sub light guide, so that the sub light guide is provided. Since the weight of the light plate is reduced, the problems of the background art can be solved.
また、本発明によるバックライト装置は、好ましくは、上記構成において、第１の副導光体および第２の導光体の光入射面に複数色発光の固体発光素子から出射する光を入光させる入射角を持たせたことにより、複数色発光の固体発光素子から出射する光を光利用効率を向上させることができるので、背景技術の課題を解決することができる。 In the backlight device according to the present invention, preferably, in the above-described configuration, the light emitted from the solid-state light emitting elements emitting multiple colors is incident on the light incident surfaces of the first sub-light guide and the second light guide. By providing the incident angle, it is possible to improve the light utilization efficiency of the light emitted from the solid-state light emitting element emitting multiple colors, so that the problem of the background art can be solved.
また、本発明による表示装置は、内面に画素形成用の電極を有する一対の透明基板の間に液晶層を挟持して構成された液晶表示パネルと、この液晶表示パネルの背面に設置された光学補償シート積層体と、この光学シート積層体の背面に設置された上記構成によるバックライト装置とで構成することにより、輝度及び色度の均一性が向上され、高品位の画像表示が得られるので、背景技術の課題を解決することができる。 In addition, a display device according to the present invention includes a liquid crystal display panel configured by sandwiching a liquid crystal layer between a pair of transparent substrates having pixels for forming pixels on the inner surface, and an optical device installed on the back surface of the liquid crystal display panel. By configuring the compensation sheet laminate and the backlight device having the above-described configuration installed on the back of the optical sheet laminate, the uniformity of brightness and chromaticity is improved, and high-quality image display can be obtained. The problem of the background art can be solved.
なお、本発明は上記構成に限定されるものではなく、本発明の技術思想を逸脱することなく、種々の変更が可能である。 The present invention is not limited to the above-described configuration, and various modifications can be made without departing from the technical idea of the present invention.
本発明によるバックライト装置によれば、固体発光素子背面直下型バックライト部の厚さを薄く構成して実効光路長を長くとることができるので、輝度均一性及び色度均一性の高い光源光が得られ、輝度／消費電力を向上させ、固体発光素子の数量及び光学部材の低減ができるなどの極めて優れた効果を有する。 According to the backlight device of the present invention, it is possible to reduce the thickness of the backlight unit directly under the back surface of the solid-state light emitting element and increase the effective optical path length, so that the light source light having high luminance uniformity and high chromaticity uniformity. Thus, the luminance / power consumption is improved, and the number of solid light emitting elements and the number of optical members can be reduced.
また、本発明によるバックライト装置によれば、副導光体の材質を透光性液体とすることにより、バックライト部を軽量化することができる。また、副導光体を少なくとも一層の空気層を介して複数分割して構成することにより、さらに軽量化が可能となるとともに、光路長を長くとることができ、さらにサイドエミッタタイプの固体発光素子を用いることにより、光利用効率をさらに向上させ、高輝度が得られるなどの極めて優れた効果を有する。 Further, according to the backlight device of the present invention, the backlight portion can be reduced in weight by using a light-transmitting liquid as the material of the sub light guide. In addition, the light guide can be further reduced in weight by configuring the sub light guide member into a plurality of parts separated through at least one air layer, and the optical path length can be increased. Further, the side emitter type solid state light emitting device By using, the light utilization efficiency is further improved and high brightness can be obtained.
また、本発明によるバックライト装置によれば、水銀を使用した冷陰極蛍光ランプと比較して略同等以上の輝度均一性及び色度均一性の高い光源光が得られ、しかも環境に対応した水銀レスの大型表示装置用の固体発光素子背面直下型バックライトが実現可能となるなどの極めて優れた効果が得られる。 Further, according to the backlight device of the present invention, it is possible to obtain light source light having high luminance uniformity and chromaticity uniformity which is substantially equal to or higher than that of a cold cathode fluorescent lamp using mercury, and is also compatible with the environment. An extremely excellent effect can be obtained, for example, that it is possible to realize a backlight directly under a solid light emitting element for a large-sized display device.
また、本発明による表示装置によれば、固体発光素子の背面直下型バックライト装置から輝度均一性及び色度均一性の高い光源光が得られるので、色再現性の高い、しかも応答度が速い高輝度の表示画像が得られるなどの極めて優れた効果を有する。 In addition, according to the display device of the present invention, the light source light having high luminance uniformity and chromaticity uniformity can be obtained from the backlight device directly under the back surface of the solid light emitting element, so that the color reproducibility is high and the responsiveness is fast. It has extremely excellent effects such as a high brightness display image.
以下、本発明の具体的な実施の形態について、各実施例の図面を参照して詳細に説明する。 Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings of the respective examples.
図１は、本発明によるバックライト装置及びこのバックライト装置を有する表示装置として液晶表示装置の実施例１による構成を説明する要部断面図である。図１において、参照符号ＰＮＬは表示パネルとしての液晶表示パネルであり、この液晶表示パネルＰＮＬは第１の基板ＳＵＢ１と第２の基板ＳＵＢ２との間に液晶層を挟持してなり、ガラス製の第１の基板ＳＵＢ１と第２の基板ＳＵＢ２との双方または一方の内面に画素形成用に電極またはアクティブ素子などを有している。なお、薄膜トランジスタ（ＴＦＴ）などのアクティブ素子を形成した第１の基板ＳＵＢ１をアクティブ・マトリクス基板、薄膜トランジスタを用いたものをＴＦＴ基板とも称する。 FIG. 1 is a cross-sectional view of an essential part for explaining a configuration according to a first embodiment of a liquid crystal display device as a backlight device according to the present invention and a display device having the backlight device. In FIG. 1, reference numeral PNL is a liquid crystal display panel as a display panel, and this liquid crystal display panel PNL has a liquid crystal layer sandwiched between a first substrate SUB1 and a second substrate SUB2, and is made of glass. The first substrate SUB1 and the second substrate SUB2 have electrodes or active elements for forming pixels on the inner surface of one or both of them. Note that the first substrate SUB1 on which an active element such as a thin film transistor (TFT) is formed is also referred to as an active matrix substrate, and a substrate using a thin film transistor is also referred to as a TFT substrate.
また、第１の主面（バックライト装置側）には第１の偏光板ＰＯＬ１が、第２の主面（表示面側）には第２の偏光板ＰＯＬ２がそれぞれ貼り付けなどにより積層されて設置されている。さらに、この液晶表示パネルＰＮＬの背面側には、光学補償シート積層体ＯＰＳが設置されており、この光学補償シート積層体ＯＰＳは、後述するバックライト装置の主導光板と対面する側から第１の拡散シート，第１のプリズムシート，第２のプリズムシート，第２の拡散シートの順で貼り付けなどにより積層されて構成されている。 The first polarizing plate POL1 is laminated on the first main surface (backlight device side), and the second polarizing plate POL2 is laminated on the second main surface (display surface side) by pasting or the like. is set up. Further, an optical compensation sheet laminate OPS is installed on the back side of the liquid crystal display panel PNL, and the optical compensation sheet laminate OPS is a first from the side facing the main light plate of the backlight device described later. The diffusion sheet, the first prism sheet, the second prism sheet, and the second diffusion sheet are laminated in order, for example.
また、この光学補償シート積層体ＯＰＳの背面側には、本発明によるバックライト装置ＢＬが設置されている。このバックライト装置ＢＬは、光学補償シート積層体ＯＰＳ側に光を面状に展開して出射する光出射面を有し、その反対向面に光を上記光出射面に反射させる光反射面を有する主導光板ＧＬＢＭの背面側にそのほぼ中央部分に長さ方向に沿って光導入口となる第１の空気層ＡＲＬ１が設けられ、この第１の空気層ＡＲＬ１を中心としてその両側には第１の副導光体ＧＬＢＳ１と当該第２の副導光体ＧＬＢＳ２とに２分割されて形成された副導光板ＧＬＢＳとが設置されている。 Further, a backlight device BL according to the present invention is installed on the back side of the optical compensation sheet laminate OPS. This backlight device BL has a light emitting surface for spreading and emitting light in a planar shape on the optical compensation sheet laminate OPS side, and a light reflecting surface for reflecting light to the light emitting surface on the opposite surface. A first air layer ARL1 serving as a light entrance along the length direction is provided at a substantially central portion on the back side of the main light guide plate GLBM, and the first air layer ARL1 is provided on both sides of the first air layer ARL1 as a center. A sub light guide plate GLBS formed by dividing the sub light guide GLBS1 into a second sub light guide GLBS2 is provided.
さらにこの副導光板ＧＬＢＳの表裏面には、それぞれ光反射板ＲＥＦ１及び光反射板ＲＥＦ２が貼り付けなどにより設置されている。なお、これらの主導光板ＧＬＢＭ及び副導光板ＧＬＢＳ（副導光板ＧＬＢＳ１及び副導光板ＧＬＢＳ２）は透明アクリル樹脂板材などにより形成されている。また、この第１の空気層ＡＲＬ１を介して両側に設置された第１の副導光体ＧＬＢＳ１と第２の副導光体ＧＬＢＳ２との対向端には、これらの第１の副導光板ＧＬＢＳ１及び第２の副導光板ＧＬＢＳ２内にそれぞれ光を導入させる光導入口としての光入射面ＧＬＢＳＩ１及び光入射面ＧＬＢＳＩ２が形成されている。 Further, a light reflection plate REF1 and a light reflection plate REF2 are respectively attached to the front and back surfaces of the sub light guide plate GLBS by pasting. The main light guide plate GLBM and the sub light guide plate GLBS (sub light guide plate GLBS1 and sub light guide plate GLBS2) are formed of a transparent acrylic resin plate material or the like. In addition, the first sub light guide plate GLBS1 is disposed at the opposite end of the first sub light guide GLBS1 and the second sub light guide GLBS2 installed on both sides via the first air layer ARL1. In addition, a light incident surface GLBSI1 and a light incident surface GLBSI2 are formed as light entrances for introducing light into the second sub light guide plate GLBS2.
また、積層された主導光板ＧＬＢＭ及び副導光板ＧＬＢＳの四辺の両端面には光学的に結合させる断面略Ｕ字状の光反射板ＲＥＦが貼り付けなどにより設置され、さらにこの副導光板ＧＬＢＳの背面には、図２に要部斜視図で示すように第１の空気層ＡＲＬ内にＲ（赤），Ｇ（緑），Ｂ（青）の３色発光のサイドエミッタタイプの固体発光素子（以下、発光ダイオードと称する）ＬＥＤを一列方向に配列させた発光ダイオード基板ＬＥＤＰが設置されて構成されている。なお、これらの３色発光の複数色発光の発光ダイオードＬＥＤは、例えばＲ（赤），Ｇ（緑），Ｇ（緑），Ｂ（青）に順に配列され、第１の空気層ＡＲＬ内に完全の収容されるように設置される。 Further, light reflecting plates REF having a substantially U-shaped cross section to be optically coupled are attached to both end surfaces of the four sides of the laminated main light guide plate GLBM and sub light guide plate GLBS, and further, the sub light guide plate GLBS On the back side, as shown in a perspective view of the main part in FIG. 2, a side emitter type solid-state light emitting element (R (red), G (green), B (blue)) emitting three colors in the first air layer ARL ( A light-emitting diode substrate LEDP in which LEDs (hereinafter referred to as light-emitting diodes) are arranged in a line is installed. These three-color light emitting diodes LED emitting multiple colors are arranged in order of, for example, R (red), G (green), G (green), and B (blue), and are arranged in the first air layer ARL. Installed to be fully contained.
このように構成されたバックライト装置ＢＬは、図１に示すように３色発光の発光ダイオードＬＥＤから出射された光が矢印Ａで示す方向に第１の空気層ＡＲＬ１内に形成された両光入射面ＧＬＢＳＩ１及び光入射面ＧＬＢＳＩ２からそれぞれ第１の副導光体ＧＬＢＳ１と第２の副導光体ＧＬＢＳ２内に入射され、表裏面の光反射板ＲＥＦ１，ＲＥＦ２により反射及び拡散されてながら混色されて副導光板ＧＬＢＳ内を伝搬し、両端面の光反射板ＲＥＦにより反射され、主導光板ＧＬＢＭ内に導入される。主導光板ＧＬＢＭに導入された光はその背面に形成されている光反射面により反射されてその前面に形成されている光出射面から出射し、光学補償シート積層体ＯＰＳを透過して液晶表示パネルＰＮＬの背面に向けて出射される。 In the backlight device BL configured as described above, the light emitted from the three-color light emitting diodes LED is formed in the first air layer ARL1 in the direction indicated by the arrow A as shown in FIG. The light enters the first sub light guide GLBS1 and the second sub light guide GLBS2 from the incident surface GLBSI1 and the light incident surface GLBSI2, respectively, and is mixed while being reflected and diffused by the light reflecting plates REF1 and REF2 on the front and back surfaces. Then, it propagates in the sub light guide plate GLBS, is reflected by the light reflecting plates REF on both end faces, and is introduced into the main light plate GLBM. The light introduced into the main light guide plate GLBM is reflected by the light reflecting surface formed on the back surface thereof, is emitted from the light emitting surface formed on the front surface thereof, passes through the optical compensation sheet laminate OPS, and is displayed on the liquid crystal display panel. The light is emitted toward the back of the PNL.
ここで、Ｒ（赤），Ｇ（緑），Ｂ（青）の３色発光の発光ダイオードＬＥＤは、各種の放射特性のものを使用することが可能である。例えば、発光ダイオードＬＥＤからの出射光Ｌの出射角度θと光強度との関係が図３に示すドームエミッタタイプ発光ダイオードＬＥＤのランバシアン放射パターンのものを用いても良い。なお、このランバシアン放射パターンとは、出射角度θが２０°〜４０°及び−２０°〜−４０°で光強度がピークとなり、固体発光素子ＬＣＤの真上の光強度はやや低く、６０°〜８０°以上または−６０°〜−８０°以下ではピークの半分以下に減衰する特性のパターンである。 Here, as the light emitting diodes LED emitting three colors of R (red), G (green), and B (blue), those having various radiation characteristics can be used. For example, the relationship between the emission angle θ of the emitted light L from the light emitting diode LED and the light intensity may be a Lambtian radiation pattern of the dome emitter type light emitting diode LED shown in FIG. In addition, the Lambtian radiation pattern has a light intensity peak when the emission angle θ is 20 ° to 40 ° and −20 ° to −40 °, and the light intensity directly above the solid state light emitting device LCD is slightly low, from 60 ° to It is a pattern of characteristics that attenuates to less than half of the peak at 80 ° or more or −60 ° to −80 ° or less.
また、Ｒ（赤），Ｇ（緑），Ｂ（青）の３色発光の発光ダイオードＬＥＤには、上述したランバシアン放射パターンの他にサイドエミッタタイプのものがある。サイドエミッタタイプ発光ダイオードＬＥＤの放射パターンは、図４に示すように出射角度θが６０°〜１００°及び−６０°〜−１００°をピークとして急激に光強度が減衰している特性を有している。つまり、出射光の殆どが発光ダイオードＬＥＤの真横に出射するという放射パターンである。本発明の構成では、このようなサイドエミッタタイプの発光ダイオードＬＥＤの光源を使用すれば、効率良く副導光体ＧＬＢＳ内に光を入射させることができるので、極めて有効である。つまり、副導光板ＧＬＢＳに対して直接光を入射させることが高効率で実現できる。 In addition, the three-color light emitting diode LED of R (red), G (green), and B (blue) includes a side emitter type in addition to the Lambertian radiation pattern described above. As shown in FIG. 4, the radiation pattern of the side emitter type light emitting diode LED has a characteristic in which the light intensity is suddenly attenuated with the emission angles θ peaking at 60 ° to 100 ° and −60 ° to −100 °. ing. That is, it is a radiation pattern in which most of the emitted light is emitted directly beside the light emitting diode LED. In the configuration of the present invention, if such a light source of a side emitter type light emitting diode LED is used, light can be efficiently incident into the sub light guide GLBS, which is extremely effective. That is, it is possible to realize the direct incidence of light to the sub light guide plate GLBS with high efficiency.
図５は、本発明によるバックライト装置の他の構成例を説明する要部断面図であり、前述した図と同一部分には同一符号を付し、その説明は省略する。図５において、図２と異なる点は、第１の副導光板ＧＬＢＳ１と第２の副導光板ＧＬＢＳ２との間に形成された光導入口となる第１の空気層ＡＲＬ１内には、図６に要部斜視図で示すようにＲ（赤），Ｇ（緑），Ｂ（青）の３色発光の発光ダイオードＬＥＤ１，ＬＥＤ２を２列に配列して搭載させた発光ダイオード基板ＬＥＤＰが配設されている。なお、この場合、第１の空気層ＡＲＬ１の面方向の幅を広げる必要がある。また、図示しないが、図６に示す発光ダイオードＬＥＤ１，ＬＥＤ２を互い違いにずらせて配置することにより、さらに光を有効に利用する構成も可能である。 FIG. 5 is a cross-sectional view of an essential part for explaining another configuration example of the backlight device according to the present invention. The same parts as those in the above-mentioned figure are denoted by the same reference numerals, and the description thereof is omitted. 5 differs from FIG. 2 in the first air layer ARL1 serving as a light entrance formed between the first sub light guide plate GLBS1 and the second sub light guide plate GLBS2. As shown in the perspective view of the main part, a light emitting diode substrate LEDP on which R (red), G (green), and B (blue) light emitting diodes LED1 and LED2 are arranged in two rows is arranged. Has been. In this case, it is necessary to increase the width in the surface direction of the first air layer ARL1. Moreover, although not shown in figure, the structure which utilizes light more effectively is also possible by arrange | positioning light emitting diode LED1, LED2 shown in FIG.
図７は、本発明によるバックライト装置のさらに他の構成例を説明する要部断面図であり、前述した図２と同一部分には同一符号を付し、その説明は省略する。図６において、図２と異なる点は、第１の副導光板ＧＬＢＳ１と第２の副導光板ＧＬＢＳ２との間に形成された第１の空気層ＡＲＬ１内にはその上下方向（板厚方向）からそれぞれＲ（赤），Ｇ（緑），Ｂ（青）の３色発光の発光ダイオードＬＥＤ１，ＬＥＤ２を配列されて形成された発光ダイオード基板ＬＥＤＰ１，ＬＥＤＰ２がそれぞれ対向させて設置されている。 FIG. 7 is a cross-sectional view of an essential part for explaining still another configuration example of the backlight device according to the present invention. The same parts as those in FIG. 6 is different from FIG. 2 in that the first air layer ARL1 formed between the first sub light guide plate GLBS1 and the second sub light guide plate GLBS2 has its vertical direction (plate thickness direction). , LED substrates LEDP1 and LEDP2 formed by arranging light emitting diodes LED1 and LED2 emitting three colors of R (red), G (green), and B (blue) are arranged to face each other.
図８は、本発明によるバックライト装置の他の構成例を説明する要部断面図であり、前述した図２と同一部分には同一符号を付し、その説明は省略する。図６において、図２と異なる点は、第１の副導光板ＧＬＢＳ１と第２の副導光板ＧＬＢＳ２との間に形成された第１の空気層ＡＲＬ１内にはその上下方向（板厚方向）からそれぞれ２組のＲ（赤），Ｇ（緑），Ｂ（青）の３色発光の発光ダイオードＬＥＤ１，ＬＥＤ２を二列に配列されて形成された発光ダイオード基板ＬＥＤＰ１，ＬＥＤＰ２がそれぞれ対向させて設置されている。 FIG. 8 is a cross-sectional view of an essential part for explaining another configuration example of the backlight device according to the present invention. The same parts as those in FIG. 6 is different from FIG. 2 in that the first air layer ARL1 formed between the first sub light guide plate GLBS1 and the second sub light guide plate GLBS2 has its vertical direction (plate thickness direction). LED sets LEDP1 and LEDP2 formed by arranging two sets of R (red), G (green), and B (blue) three-color light emitting diodes LED1 and LED2 in two rows respectively. is set up.
このような構成においては、第１の空気層ＡＲＬ１内にＲ（赤），Ｇ（緑），Ｂ（青）の３色発光の発光ダイオードＬＥＤ１，ＬＥＤ２を２列に配列して配置することにより、副導光板ＧＬＢＳ（第１の副導光板ＧＬＢＳ１及び第２の副導光板ＧＬＢＳ２）内に入射する光量が増大させることができるので、輝度の向上効果が得られ、発光ダイオードＬＥＤ１及び発光ダイオードＬＥＤ２の数量を制御することで、所望の輝度を得ることができる。また、第１の副導光板ＧＬＢＳ１と第２の副導光板ＧＬＢＳ２とに同一波長の光が同時に且つ大量に出射し、両者にバランス良く光入射されて色混合されるので、輝度均一性及び色度均一性の高い光源光が得られる。 In such a configuration, the R (red), G (green), and B (blue) light emitting diodes LED1 and LED2 are arranged in two rows in the first air layer ARL1. Since the amount of light incident on the sub light guide plate GLBS (the first sub light guide plate GLBS1 and the second sub light guide plate GLBS2) can be increased, the effect of improving the luminance is obtained, and the light emitting diode LED1 and the light emitting diode LED2 The desired brightness can be obtained by controlling the quantity. In addition, since a large amount of light having the same wavelength is emitted simultaneously and in large quantities to the first sub light guide plate GLBS1 and the second sub light guide plate GLBS2, the light is well balanced and color mixing is performed. Highly uniform light source light can be obtained.
発光ダイオードＬＥＤ（発光ダイオードＬＥＤ１及び発光ダイオードＬＥＤ２）からの出射光を入射させる副導光板ＧＬＢＳ（第１の副導光板ＧＬＢＳ１及び第２の副導光板ＧＬＢＳ２）の各光入射面ＧＬＢＳＩ１及び光入射面ＧＬＢＳＩ２の形状は、副導光板ＧＬＢＳ内を伝搬する光の光路長を左右する重要な要素である。発光ダイオードＬＥＤの光放射パターンが中心部で約８０°であり、光度が半分となる半値幅が±約２０°であるということから、中心部の光線が入射角０°、つまり空気層−導光板境界面で屈折しないようにすると、図９に要部拡大断面図で示すように光入射面ＧＬＢＳＩ１及び光入射面ＧＬＢＳＩ２の傾斜角αを約１０°に設定する。本実施例において、傾斜角αが約１０°とは、最大の効果が期待でき、例えば５°〜１５°の範囲の場合でも効果が期待できるということを示すものである。 Each light incident surface GLBSI1 and light incident surface of the sub light guide plate GLBS (first sub light guide plate GLBS1 and second sub light guide plate GLBS2) on which light emitted from the light emitting diode LED (light emitting diode LED1 and light emitting diode LED2) is made incident. The shape of GLBSI2 is an important element that determines the optical path length of light propagating in the sub light guide plate GLBS. Since the light emission pattern of the light emitting diode LED is about 80 ° at the center and the half width at which the light intensity is halved is about ± 20 °, the light beam at the center has an incident angle of 0 °, that is, air layer-conduction. If the light is not refracted at the boundary surface of the optical plate, the inclination angle α of the light incident surface GLBSI1 and the light incident surface GLBSI2 is set to about 10 ° as shown in the enlarged sectional view of the main part in FIG. In the present embodiment, the inclination angle α of about 10 ° indicates that the maximum effect can be expected, for example, the effect can be expected even in the range of 5 ° to 15 °.
図１０は、第２の副導光板ＧＬＢＳ２の光入射面ＧＬＢＳＩ２の傾斜角αを約１０°に設定した場合における光路長ＬＲの概念を示す断面図であり、図１１は光入射面ＧＬＢＳＩ２に傾斜角がない（傾斜角α＝０°）場合における従来構成の光路長ＬＲの概念を示す断面図である。なお、βは発光ダイオードＬＥＤからの発光光の入射角である。 FIG. 10 is a cross-sectional view showing the concept of the optical path length LR when the inclination angle α of the light incident surface GLBSI2 of the second sub light guide plate GLBS2 is set to about 10 °, and FIG. 11 is inclined to the light incident surface GLBSI2. It is sectional drawing which shows the concept of the optical path length LR of the conventional structure in case there is no angle | corner (inclination angle (alpha) = 0 degree). Note that β is an incident angle of light emitted from the light emitting diode LED.
図１０から明らかなように光入射面ＧＬＢＳＩ２の傾斜角αを約１０°に設定した場合の方が傾斜角αがない図１１と比較して下記表１に示すように光路長ＬＲを長くすることができる。これによって発光ダイオードＬＥＤから出射する出射光の光利用効率を大幅に向上させることができる。なお、本実施例では、第２の副導光板ＧＬＢＳ２について説明したが、第１の副導光板ＧＬＢＳ１においても全く同様の効果が得られる。
As apparent from FIG. 10, the optical path length LR is increased as shown in Table 1 below when the inclination angle α of the light
現在、主導光板及び副導光板は、アクリル系またはポリカボネート系などの透光性樹脂材により製作されているが、これらの透光性樹脂材の密度は約１．１０ｇ／ｃｍ3程度であり、製品化されている冷陰極蛍光ランプを光源としている２０インチ型クラスの液晶テレビでは、主導光板１枚のみを使用しているが、この主導光板の重量は、約１Ｋｇ以上と極めて重い。また、Ｒ（赤），Ｇ（緑），Ｂ（青）の３色発光の発光ダイオードを光源とする同型の液晶テレビでは主導光板と副導光板とを合わせて約２Ｋｇ程度になる。 At present, the main light guide plate and the sub light guide plate are made of a translucent resin material such as acrylic or polycarbonate, and the density of these translucent resin materials is about 1.10 g / cm 3 , A liquid crystal television of the 20-inch type that uses a commercial cold cathode fluorescent lamp as a light source uses only one main light plate, and the weight of the main light plate is extremely heavy, about 1 kg or more. In a liquid crystal television of the same type that uses light emitting diodes of three colors of light emission of R (red), G (green), and B (blue) as light sources, the total of the main light plate and the sub light guide plate is about 2 kg.
そこで、軽量化するための手段として前述した副導光板ＧＬＢＳをアクリル系またはポリカボネート系などの透光性樹脂材よりも重量が軽く、しかも屈折率が大きく変化しない例えば水などのような透光性の液体を用い、この液体をアクリル系樹脂材などから形成する容器に封入して構成する。一例として１００ｍｍ×５００ｍｍ×１０ｍｍの副導光板の材質違いによる重量を比較すると、約１２％程度軽量化することができ、１台当り約１５０ｇ程度軽量化することができる。 Therefore, as a means for reducing the weight, the above-described sub light guide plate GLBS is lighter in weight than the light-transmitting resin material such as acrylic or polycarbonate, and the refractive index does not change greatly. The liquid is used, and the liquid is sealed in a container formed of an acrylic resin material or the like. As an example, when the weight of the sub light guide plate of 100 mm × 500 mm × 10 mm is compared, the weight can be reduced by about 12%, and the weight can be reduced by about 150 g per unit.
図１２は、現行のアクリル樹脂材から形成された副導光板ＧＬＢＳ（アクリル導光板）にSnellの法則を考慮した光路長の概念を示す断面図を、図１３は透光性アクリル樹脂材などからなる容器ＣＯＮ内に透光性液体として例えば水ＷＡＴを封入して形成された副導光板ＧＬＢＳＣ（水導光板）にSnellの法則を考慮した光路長の概念を示す断面図をそれぞれ示したものである。なお、透光性アクリル樹脂材の屈折率は約１．４９であり、水の屈折率は約１．３３である。また、発光ダイオードから出射する発光光の入射角をβとし、導光板長さと光路長との関係を計算により求め、その結果を下記表２に示す。 FIG. 12 is a sectional view showing a concept of an optical path length in consideration of Snell's law in a sub light guide plate GLBS (acrylic light guide plate) formed from a current acrylic resin material, and FIG. 13 is from a translucent acrylic resin material or the like. Each of the sub-light guide plates GLBSC (water light guide plate) formed by enclosing, for example, water WAT as a translucent liquid in the container CON, is a cross-sectional view showing the concept of the optical path length in consideration of Snell's law. is there. In addition, the refractive index of the translucent acrylic resin material is about 1.49, and the refractive index of water is about 1.33. The incident angle of the emitted light emitted from the light emitting diode is β, and the relationship between the light guide plate length and the optical path length is obtained by calculation. The results are shown in Table 2 below.
表２から明らかなように図１３に示す導光板材質を水ＷＡＴとした導光板ＧＬＢＳＣ（水導光板）の場合、水ＷＡＴの屈折率はアクリル樹脂材よりも若干小さくなるが、アクリル容器ＣＯＮを用いることにより、光路長ＬＲは、図１２に示す現行の副導光板ＧＬＢＳ（アクリル導光板）より、寧ろ長くすることができる。この効果により、光源とするＲ（赤），Ｇ（緑），Ｂ（青）の３色発光の発光ダイオードの色混合が促進され、照光面内の色均一性を高くすることができる。また、色均一性が副導光板ＧＬＢＳ（アクリル導光板）で充分な場合は、副導光板ＧＬＢＳ（アクリル導光板の場合）の光路長ＬＲに導光板ＧＬＢＳＣ（水導光板）の光路長ＬＲを合わせることができるということであり、導光板長さを短くすることができるので、さらなる軽量化が可能となる。 As is clear from Table 2, in the case of the light guide plate GLBSC (water light guide plate) in which the light guide plate material shown in FIG. 13 is water WAT, the refractive index of the water WAT is slightly smaller than that of the acrylic resin material. By using, the optical path length LR can be made longer than the current sub light guide plate GLBS (acrylic light guide plate) shown in FIG. Due to this effect, color mixing of the light emitting diodes of R (red), G (green), and B (blue) that emit light as light sources is promoted, and the color uniformity in the illumination surface can be increased. Further, when the color uniformity is sufficient for the sub light guide plate GLBS (acrylic light guide plate), the optical path length LR of the light guide plate GLBSC (water light guide plate) is set to the optical path length LR of the sub light guide plate GLBS (in the case of the acrylic light guide plate). This means that the length of the light guide plate can be shortened, so that further weight reduction is possible.
図１４は、本発明によるバックライト装置の実施例４の構成を説明する副導光板の要部拡大断面図であり、前述した図と同一部分には同一符号を付し、その説明は省略する。図１４において、副導光板ＧＬＢＳ（第１の副導光板ＧＬＢＳ１及び第２の副導光板ＧＬＢＳ２）を第３の副導光板ＧＬＢＳ３と第４の副導光板ＧＬＢＳ４とに２分割して構成され、その中間部分に内部に空気のみが存在する第２の空気層ＡＲＬ２が設けられて構成されている。なお、本実施例では、第２の副導光板ＧＬＢＳ２を２分割した場合について説明したが、図示しないが、前述した第１の副導光板ＧＬＢＳ１ついても同一構成で２分割して形成されている。 FIG. 14 is an enlarged cross-sectional view of the main part of the sub light guide plate for explaining the configuration of the embodiment 4 of the backlight device according to the present invention. . In FIG. 14, the sub light guide plate GLBS (first sub light guide plate GLBS1 and second sub light guide plate GLBS2) is divided into a third sub light guide plate GLBS3 and a fourth sub light guide plate GLBS4. A second air layer ARL2 in which only air is present is provided in the middle portion. In the present embodiment, the case where the second sub light guide plate GLBS2 is divided into two parts has been described. However, although not shown, the first sub light guide plate GLBS1 is also divided into two parts with the same configuration. .
このような構成によれば、副導光板ＧＬＢＳの体積が第２の空気層ＡＲＬ２の体積と略等しい２分割とすることにより、副導光板ＧＬＢＳの重量を約２／３に軽量化することができる。 According to such a configuration, the weight of the sub light guide plate GLBS can be reduced to about 2/3 by dividing the volume of the sub light guide plate GLBS into two substantially equal to the volume of the second air layer ARL2. it can.
図１５は、図１４に説明した副導光板ＧＬＢＳの長さＬ＝１００ｍｍとし、板厚をＴ＝６ｍｍ、第３の副導光板ＧＬＢＳ３及び第４の副導光板ＢＬＢ４の長さをＬ１＝３５ｍｍとし、第２の空気層ＡＲＬ２の長さをＬ２＝３０ｍｍで２分割した場合における光路長の概念を示す断面図である。本実施例においては、副導光板ＧＬＢＳの重量が連続した副導光板に対して約７０％と軽量化することができた。また、発光ダイオードからの発光光の入射角βに対して光路長を計算すると、下記表３に示すように入射角βが大きくなるのに伴って分割した第３の副導光板ＧＬＢＳ３及び第４の副導光板ＧＬＢＳ４の方が光路長を大きくすることができる。 15, the length L of the sub light guide plate GLBS described in FIG. 14 is L = 100 mm, the plate thickness is T = 6 mm, and the lengths of the third sub light guide plate GLBS3 and the fourth sub light guide plate BLB4 are L1 = 35 mm. FIG. 5 is a cross-sectional view showing the concept of the optical path length when the length of the second air layer ARL2 is divided into two at L2 = 30 mm. In this embodiment, the weight of the sub light guide plate GLBS can be reduced to about 70% with respect to the sub light guide plate having a continuous weight. Further, when the optical path length is calculated with respect to the incident angle β of the light emitted from the light emitting diode, as shown in Table 3 below, the third sub light guide plates GLBS3 and fourth divided as the incident angle β increases. The sub light guide plate GLBS4 can increase the optical path length.
図１６は、本発明によるバックライト装置の実施例５の構成を説明する副導光板の要部拡大断面図であり、前述した図と同一部分には同一符号を付し、その説明は省略する。図１６において、副導光板ＧＬＢＳ２が第３の導光板ＧＬＢＳ３と第４の導光板ＧＬＢＳ４と第５の導光板ＧＬＢＳ５とに３分割して構成され、その中間部に第３の空気層ＡＲＬ３と第４の空気層ＡＲＬ４とが設けられて構成されている。この場合も、第２の副導光板ＧＬＢＳ２を３分割した場合について説明したが、図示しないが前述した第１の副導光板ＧＬＢＳ１についても同一構成で３分割して形成されている。 FIG. 16 is an enlarged cross-sectional view of the main part of the sub light guide plate for explaining the configuration of the fifth embodiment of the backlight device according to the present invention. . In FIG. 16, the sub light guide plate GLBS2 is divided into a third light guide plate GLBS3, a fourth light guide plate GLBS4, and a fifth light guide plate GLBS5, with the third air layer ARL3 and the And four air layers ARL4 are provided. Also in this case, the case where the second sub light guide plate GLBS2 is divided into three parts has been described. However, although not shown, the above-described first sub light guide plate GLBS1 is also divided into three parts with the same configuration.
このような構成によれば、副導光板ＧＬＢＳの体積が第３の空気層ＡＲＬ３及び第４の空気層ＡＲＬ４の体積と略等しい３分割とすることにより、副導光板ＧＬＢＳの重量を約３／５に軽量化することができる。この場合、副導光板ＧＬＢＳを３分割することにより、さらに軽量化できるとともに、光路長をさらに大きくすることができる。 According to such a configuration, the volume of the sub light guide plate GLBS is divided into three substantially equal to the volumes of the third air layer ARL3 and the fourth air layer ARL4, so that the weight of the sub light guide plate GLBS is about 3 / The weight can be reduced to 5. In this case, by dividing the sub light guide plate GLBS into three, the weight can be further reduced and the optical path length can be further increased.
図１７は、本発明による表示装置の全体構成例を説明する展開斜視図である。図１７において、液晶表示パネルＰＮＬは、液晶表示セルの周囲（ここでは上辺と左辺）に駆動回路を搭載し、これらの駆動回路に信号を供給するプリント基板ＰＣＢを備えている。また、この液晶表示セルの表裏面にはそれぞれ偏光板ＰＯＬ１，ＰＯＬ２が積層されている。この液晶表示パネルＰＮＬの背面に設置されるバックライト装置ＢＬは、導光板ＧＬＢ（主導光板及び副導光板），発光ダイオードを搭載した発光ダイオード基板及び光反射板などを収納したモールドフレームＭＤＬを有し、このモールドフレームＭＤＬにより支持されている。また、導光板ＧＬＢの上方にはそれぞれ二組のプリズムシート及び拡散シートからなる光学補償シートＯＰＳが載置されている。 FIG. 17 is a developed perspective view illustrating an example of the overall configuration of a display device according to the present invention. In FIG. 17, the liquid crystal display panel PNL includes a printed circuit board PCB that mounts drive circuits around the liquid crystal display cells (here, the upper side and the left side) and supplies signals to these drive circuits. Further, polarizing plates POL1 and POL2 are laminated on the front and back surfaces of the liquid crystal display cell, respectively. The backlight device BL installed on the back surface of the liquid crystal display panel PNL has a mold frame MDL that houses a light guide plate GLB (leading light plate and sub light guide plate), a light emitting diode substrate on which a light emitting diode is mounted, a light reflecting plate, and the like. However, it is supported by this mold frame MDL. An optical compensation sheet OPS made up of two sets of prism sheets and diffusion sheets is placed above the light guide plate GLB.
この構成例では、前述した各実施例のバックライト装置ＢＬはモールドＭＤＬの内縁部に配置された形状弾性部材ＧＳにより設置されている。この形状弾性部材ＧＳを介在して液晶表示パネルＰＮＬが載置され、その上方から上フレームＳＨＤを被せて下フレームＭＦＬと接続することで一体化されている。 In this configuration example, the backlight device BL of each embodiment described above is installed by the shape elastic member GS disposed at the inner edge of the mold MDL. The liquid crystal display panel PNL is placed through this shape elastic member GS, and is integrated by covering the upper frame SHD from above and connecting to the lower frame MFL.
このように構成とした表示装置において、液晶表示パネルＰＮＬは、前述した各実施例で説明した導光板ＧＬＢ（主導光板及び副導光板），発光ダイオードを搭載した発光ダイオード基板及び光反射板などにより構成されたバックライト装置ＢＬからの光で照射され、当該液晶表パネルＰＮＬに形成された電子潜像が可視化される。 In the display device configured as described above, the liquid crystal display panel PNL includes the light guide plate GLB (leading light plate and sub light guide plate), the light emitting diode substrate on which the light emitting diode is mounted, the light reflecting plate, and the like described in the above embodiments. Irradiated with light from the configured backlight device BL, the electronic latent image formed on the liquid crystal front panel PNL is visualized.
図１８は、本発明の表示装置として液晶表示モジュールを実装した電子機器の一例であるテレビ受像機の外観図である。図１８において、このテレビ受像機は表示部ＤＳＰとスタンド部ＳＴＤとで構成され、比較的大きいサイズの画面を有する液晶表示パネルＰＮＬを有する液晶表示装置が表示部ＤＳＰに実装される。液晶表示装置の画面となる液晶表示パネルＰＮＬの有効表示領域は表示部ＤＳＰに露呈されている。このテレビ受像機の表示部ＤＳＰに本発明に係る液晶表示装置を実装することにより、色再現性の高い高品質，高信頼性の画像表示装置が実現できる。 FIG. 18 is an external view of a television receiver which is an example of an electronic device in which a liquid crystal display module is mounted as a display device of the present invention. In FIG. 18, the television receiver includes a display unit DSP and a stand unit STD, and a liquid crystal display device having a liquid crystal display panel PNL having a relatively large screen is mounted on the display unit DSP. The effective display area of the liquid crystal display panel PNL serving as the screen of the liquid crystal display device is exposed to the display unit DSP. By mounting the liquid crystal display device according to the present invention on the display unit DSP of this television receiver, a high-quality and highly reliable image display device with high color reproducibility can be realized.
なお、上述した実施例において、固体発光素子バックライト装置を有する液晶表示装置を用いた液晶表示モジュールを実装した大型液晶テレビ受像機に適用した場合について説明したが、この液晶表示パネルを用いた大型液晶モニタ，車載用液晶ディスプレイ（液晶カーナビゲーション），携帯電話用ディスプレイ，ゲーム機用液晶ディスプレイ，医療用液晶モニタ，印刷／デザイン用液晶モニタなどの表示装置に適用しても前述と同様の効果が得られる。 In the above-described embodiment, the case where the liquid crystal display module using the liquid crystal display device having the solid light emitting element backlight device is applied is described, but the large size using the liquid crystal display panel is described. Even if applied to display devices such as LCD monitors, in-vehicle LCDs (LCD car navigation), mobile phone displays, game console LCDs, medical LCD monitors, and printing / design LCD monitors, the same effects as described above can be obtained. can get.
ＰＮＬ・・・液晶表示パネル、ＳＵＢ１・・・第１の基板、ＳＵＢ２・・・第２の基板、ＰＯＬ１・・・第１の偏光板、ＰＯＬ２・・・第２の偏光板、ＯＰＳ・・・光学補償シート積層体、ＰＣＢ・・・プリント基板、ＭＤＬ・・・モールドフレーム、ＧＳ・・・形状弾性部材、ＳＨＩ・・・上フレーム、ＭＦＬ・・・下フレーム、ＧＬＢＭ・・・主導光板、ＧＬＢＳ・・・副導光板、ＧＬＢＳ１・・・第１の副導光板、ＧＬＢＳ２・・・第２の副導光板、ＧＬＢＳ３・・・第３の副導光板、ＧＬＢＳ４・・・第４の副導光板、ＡＲＬ１・・・第１空気層、ＡＲＬ２・・・第２の空気層、ＡＲＬ３・・・第３の空気層、ＡＲＬ４・・・第４の空気層、ＧＬＢＳＩ１・・・光入射面、ＧＬＢＳＩ２・・・光入射面、ＬＥＤ１・・・発光ダイオード（固体発光素子）、ＬＥＤ２・・・発光ダイオード、ＬＥＤＰ・・・発光ダイオード基板、ＬＥＤＰ１・・・発光ダイオード基板、ＬＥＤＰ２・・・発光ダイオード基板、ＲＥＦ・・・光反射板、ＲＥＦ１・・・光反射板、ＲＥＦ２・・・光反射板、ＢＬ・・・バックライト装置、ＳＴＤ・・・スタンド部、ＤＰＳ・・・表示部。
PNL ... liquid crystal display panel, SUB1 ... first substrate, SUB2 ... second substrate, POL1 ... first polarizing plate, POL2 ... second polarizing plate, OPS ... Optical compensation sheet laminate, PCB ... printed circuit board, MDL ... mold frame, GS ... shape elastic member, SHI ... upper frame, MFL ... lower frame, GLBM ... main light plate, GLBS ... Sub-light guide plate, GLBS1 ... First sub-light guide plate, GLBS2 ... Second sub-light guide plate, GLBS3 ... Third sub-light guide plate, GLBS4 ... Fourth sub-light guide plate , ARL1 ... first air layer, ARL2 ... second air layer, ARL3 ... third air layer, ARL4 ... fourth air layer, GLBSI1 ... light incident surface, GLBSI2,. ..Light incident surface, LED1 ... Light emitting diode (Solid-state light emitting element), LED2 ... Light emitting diode, LEDP ... Light emitting diode substrate, LEDP1 ... Light emitting diode substrate, LEDP2 ... Light emitting diode substrate, REF ... Light reflector, REF1 ... Light Reflector, REF2 ... light reflector, BL ... backlight device, STD ... stand unit, DPS ... display unit.
Claims (16)
前記主導光体の背面に設置され、且つ中央部に第１の空気層を介して両端側に第１の副導光体と第２の副導光体とに分割されて当該第１の空気層内で当該第１の副導光体と当該第２の副導光体との対向端面に光入射面を形成する副導光体と、
前記副導光体の前記主導光体と対向する前面に設置された第１の光反射板と、
前記副導光体の前記第１の光反射板と反対向する背面に設置された第２の光反射板と、
前記主導光体及び前記副導光体の両端面に設置され、且つ当該主導光体と副導光体とを光学的に結合させるリフレクタと、
前記副導光体の背面に対向し、且つ前記第１の空気層内に複数色発光の固体発光素子を少なくとも一列に配列させて設置された固体発光素子基板と、
を備えたことを特徴とするバックライト装置。 A leading light body having a light emitting surface that spreads and emits light in a planar shape on the front surface, and a light reflecting surface that opposes the light emitting surface and reflects light to the light emitting surface;
The first air is installed on the back surface of the main light body and is divided into a first sub-light guide and a second sub-light guide at both ends via a first air layer at the center. A sub light guide that forms a light incident surface on the opposing end surfaces of the first sub light guide and the second sub light guide in the layer;
A first light reflector installed on the front surface of the sub light guide facing the main light body;
A second light reflecting plate installed on the back surface of the sub light guide opposite to the first light reflecting plate;
Reflectors installed on both end faces of the main light body and the sub light guide, and optically coupling the main light body and the sub light guide;
A solid light emitting element substrate disposed opposite to the back surface of the sub light guide and arranged in a row of at least one row of solid color light emitting elements in the first air layer;
A backlight device comprising:
前記液晶表示パネルの背面に設置された光学補償シート積層体と、
前記光学シート積層体の背面に設置された前記請求項１乃至請求項６の何れかに記載のバックライト装置と、
を備えたことを特徴とする表示装置。 A liquid crystal display panel constructed by sandwiching a liquid crystal layer between a pair of transparent substrates having electrodes for pixel formation on the inner surface;
An optical compensation sheet laminate installed on the back of the liquid crystal display panel;
The backlight device according to any one of claims 1 to 6 installed on the back surface of the optical sheet laminate,
A display device comprising:
前記バックライト装置は、前記表示パネル側に光を出射する光出射面を有する主導光体と、
前記主導光体の背面に配置され中央部分を第１の空気層により分割して構成され、前記主導光体と光学的に結合されている副導光体と、
出射した光が前記副導光体に直接入射するように前記第１の空気層内に配置された複数の固体発光素子と、
を有すること特徴とする表示装置。 In a display device having a display panel for displaying an image and a backlight device disposed on the back of the display panel,
The backlight device has a main light body having a light emitting surface for emitting light to the display panel side;
A sub-light guide that is disposed on the back surface of the main light body and is divided by a first air layer and is optically coupled to the main light body;
A plurality of solid state light emitting devices arranged in the first air layer so that the emitted light is directly incident on the sub-light guide;
A display device comprising:
The display device according to claim 8, wherein the sub light guide has a reflective surface on upper and lower surfaces of the sub light guide.
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| JP2007220464A (en) * | 2006-02-16 | 2007-08-30 | Nec Lcd Technologies Ltd | Backlight and liquid crystal display device provided with same backlight |
| JP2007220449A (en) * | 2006-02-16 | 2007-08-30 | Nec Lcd Technologies Ltd | Backlight device and liquid crystal display |
| JP4577229B2 (en) * | 2006-02-16 | 2010-11-10 | 日本電気株式会社 | Backlight device and liquid crystal display device |
| JP2011128599A (en) * | 2009-12-16 | 2011-06-30 | Samsung Electronics Co Ltd | Backlight unit and display apparatus having the same |
| JP2013051177A (en) * | 2011-08-31 | 2013-03-14 | Toshiba Corp | Backlight device and display device |
| JP2015043339A (en) * | 2014-11-05 | 2015-03-05 | セイコーエプソン株式会社 | Light emitting device, illumination device, and projector |
| CN110764311A (en) * | 2019-11-08 | 2020-02-07 | 深圳创维－Rgb电子有限公司 | Liquid crystal module and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| US7188988B2 (en) | 2007-03-13 |
| US20050243243A1 (en) | 2005-11-03 |
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